#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

int main()
{
  pid_t id = fork();
  if(id<0)
  {
    perror("fork");
    return 1;
  }
  else if(id==0) 
  {
    //child
    printf("I am child,pid : %d\n",getpid());
    sleep(30);
  }
  else 
  {
    //parent
    printf("I am parent,pid : %d\n",getpid());
    sleep(3);
    exit(0);
  }
  return 0;
}
